ChrisV63
New User
- Location
- Crisfield, Maryland
- Occupation
- Homeowner, retired
Working on running a 2-2-2-4 feeder from my new 200 amp main panel (mounted outside on my 1903 home) to the 1950s detached concrete garage diagonally on the other side of the house at the back, and the 100 amp sub panel in it (the old 100amp panel from the house. A fairly new Square D QO surface mount panel that wil lbe perfect opnteh interior of the concrete wall). It has to run in conduit under the home's crawl space (hung by straps from the joists every 3 feet), then in a trench to the front corner of the garage, up the side to the eaves, then over and down to the panel. I know about the 360 degree rule, and there's no way in hell to have it meet that requirement between those panels fully in LFNC-B no matter how it was run...
90 ft run, with a sweeping 90 to go from the panel under the house, a gentle sweep across the crawl space to avoid support columns (almost a straight line diagonally across, though) then a sweeping 90 down to the trench to come out from under the house. The trench has a 45 degree gentle curve in it 10 ft out to line up with the garage (this avoids a concrete patio at the back that I am loathe to cut up for the project). Then up the outside wall to the eaves, before turning and going to the panel. I have to have the feeder wire in conduit in the crawl space, and in conduit up the outer wall of the garage. I'm going to be using 1 1/2" schedule 40 up the side of the garage, and the 1 1/2" LFNC-B I bought for the crawl space (no bending or joining of the schedule 40 that way, as I can do a single length of the LFNC with a gentle curve all the way with no joints and no pull difficulty). I had bought the LFNC-B to go from the main all the way to the garage (transitioning to the schedule 40 vertically) as it can be direct burial and only has to be 18" to the top, where the feeder would be direct burial 24". But that makes over 360 degrees (though I temporarily put it in there to get length, and the pull in the 1 1/2" LFNC conduit was like butter due to the very gentle bends it makes. It was also easy to pull back out).
So my question is, should I transition at the start of the trench at the house to have the feeder cable be directly buried over to the garage, then go back into the schedule 40 up the side of the garage to the eaves? This would give me slightly less than 360 degrees on the LFNC and just the below grade 90 at the garage.
Pardon the crudity of the image:
90 ft run, with a sweeping 90 to go from the panel under the house, a gentle sweep across the crawl space to avoid support columns (almost a straight line diagonally across, though) then a sweeping 90 down to the trench to come out from under the house. The trench has a 45 degree gentle curve in it 10 ft out to line up with the garage (this avoids a concrete patio at the back that I am loathe to cut up for the project). Then up the outside wall to the eaves, before turning and going to the panel. I have to have the feeder wire in conduit in the crawl space, and in conduit up the outer wall of the garage. I'm going to be using 1 1/2" schedule 40 up the side of the garage, and the 1 1/2" LFNC-B I bought for the crawl space (no bending or joining of the schedule 40 that way, as I can do a single length of the LFNC with a gentle curve all the way with no joints and no pull difficulty). I had bought the LFNC-B to go from the main all the way to the garage (transitioning to the schedule 40 vertically) as it can be direct burial and only has to be 18" to the top, where the feeder would be direct burial 24". But that makes over 360 degrees (though I temporarily put it in there to get length, and the pull in the 1 1/2" LFNC conduit was like butter due to the very gentle bends it makes. It was also easy to pull back out).
So my question is, should I transition at the start of the trench at the house to have the feeder cable be directly buried over to the garage, then go back into the schedule 40 up the side of the garage to the eaves? This would give me slightly less than 360 degrees on the LFNC and just the below grade 90 at the garage.
Pardon the crudity of the image:
